Henry mcbeide



(No Model.) ,E 2 Sheets-'Sheet 1.

A. W. HALL.

MECHANICAL TELEPHONE.

No. 336,640. Patented Feb. 23, 1886.

N PETSRS Pholo-Lith'agmpher, Washing'on. D. C.

2 Sheets Sheet 2.

(No Model.)

A. HALL.

MEOHANIGAL TELEPHONE.

No. 336,640. Patented Feb. 23, 1886. I

N. PETERS. Pholbixlhugrnplmrl Wishing, D. c.

' UNITED STATES PATENT Oriana A. \VILFORD HALL, OF XIHV YORK, X. Y.

MECHANICAL TELEPHGNE.

SPECIFICATION forming part of Letters Patent No. 336,640, dated February 23, 1886.

Application filed July 6, 1885.

T aZZ whom it may concern: Y

Be it known that I, A. 'TILFORD HALL, ol. the city and county of New York, in the State of New York, haveinvented a new and useful j Serial No. in end (X0 model.)

i and in one of its sides at right angles to the diaphragm l3 asecond diaphragm, B. To the opposite ends of the box A are connected 1m rovemcnt in Mechanical Tele hones 0t" sound-conducting tubes 0 and to the front 0 P i i i 0v wlnlchthe following isla splecficaltioi. tlgpreloflloppositg the secomg dbiapllrragin, B, is

l *lllVGDUOIl 1s a 'l 1021 e 0 w 1a are com- I a ac iet a moat inew or u e moldy known as adusticor mechanical E designates thd transinittiiigwvire, which telephones,in which the vibrations ofsound are is suitably connected to the center of the dim transmitted mechanicallythroughdiaphragms phragni B, and isstretched between this dia and a wire or 0011 extending between them or i phragin and the diaphragm ot the correspondconnected with them. ing instrument or apparatus located at the Certain features of my invention relate to other end ot'theline. Thesediaphragnis BB the employment, in one inechanical instrumay be of anysuitablematerial ordinarily eminent, 0t two diaphragnis and connections be 1 ployedin making diaphragins foracoustictelctween one diaphragm and the wire, whereby 1 phones, and are carried or clamped between long tudinal vibrations are transmitted to and 2 flanges 0., provided on the inner s de of the box received from the wire, and connections be- 5 or case A, as clearly shown in big. 1. The tween the otherdraphragm and the wire, diaphragm B inasmuch as it is to receive a 20 whereby lateral vibrations are transmitted to I! constant strain 'troin the tltlllSllllttlllg'\YllQ E, and received from the wire. should be of sufiiciently strong and thick nia Another feature of my invention relates to 3; terial for this purpose, but the diaphragm B, the 6ID1)lO 'Ill0l1t',Wlhll a transinittingwirc and .5 inasmuch as it is not SllbJBChOd in any way to adiaphragm, to which the end thereof is i the strain of the transmitt ng-wire B, may be hitched, ot a soundtuoe for conducting vibra- 1 oi'very much lighter and thinner material, and tions to operate on the diaphragm in a directheretore very much more sensitive to the inition opposite to the longitudinal pull or ten- 1 pact of sound waves or vibrations. sion of the wire, whereby the sound-vibra- It will be observed that the mouthpiece D tions are caused to act more effectively on the l is divided or has a branch, 1), leading to the 0 diaphragm, l inner side of the diaphragm l3, and when the S0 The invention also relates to other novel sender ot'a message talksinto the mouth-piece combinations of parts hereinafter described l D, the vibrations ol sound act upon both (ha and pointed out in the claims. phragins B B and transmit both lateral and In the accompanying draii'ings, Figure l. longitudinal vibrationsthrough the wiaetp the i 2 b l'" receivin 'iioaratus at the other cut 0 the 8 a lllustrates a telephone ippaiatns ein oc 1n g t 1 9 my invention, and having one diaphragm arline. When the instrument is used as a reranged in a plane transverse to the length of i ceiver, the diaphragm B receives and gives the wire and hitched thereto, and a second out the longitudinal vibrations of the wire, diaphragm arranged in a plane approximately and all lateral vibrations are conveyed to the parallel with the wire and connected therelistener through the diaphragm B. 9o wlth. Fig. 2- is asection upon theplane oi the W hen thcline and apparatus are set up for dotted line a; m, Fig. 1, showing a valve or use, it will be observed that the tensile strain damper whereby the sound-tube may be cut upon the transmitting-wire E exerts a pull ofi' from communication with the liitch-diaupon the diaphragm B, in a direction indiphragm; and Fig.3 isasectionalvicw similar cated by the arrow in Fig. 1, and therefore 65 to Fig. 1, illustrating a modified form of intends to deflect the diaphragm in that .direc strument, which also embodies inyinvention. tion.

Similar letters of reference designate corre- The branch 1') of the mouthpiece is presponding parts in the several figures. sented at what is here the inner side or the 50 A designates a box or case oi'suitablc size, diaphragm within the box A, and when the 170 mouth-piece is spoken into the sound-vibrations act upon the diaphragms B in a direction exactly opposite the longitudinal tension or pull of the wire, and hence produce much stronger vibrations of the diaphragm.

When using the instrument for sending a message, it becomes desirable to close the passage through the soundtubes G, whereby vibrations are conducted to the ears, and for this purpose I have represented dampers or valves between the sound-tubes C and the box A. As here represented, a plate or disk, 0, is fixed across the opening in the box, and a second plate or disk, c, is attached to the inner end of the soundtube 0. Each sound-tube has an outwardlyprojecting flange, which turns in a circular rabetted flange, d, attached to the box, and the disks 0 c are provided with openings 0*,whi0h are brought into positions eoincid ent with each other by the turning of the tubes 0 into the positions shown in Fig. 1, and are moved out of positions coincident wit-beach other by the turning of the tubes 0 through a quarter of a circle, and into a position wherein they'are projected upward from the box A. Instead of this ordinary form of disk-valve or damper for controlling communication between the tubes Cand the box, a valve or damper of any other desired form may be employed.

When a message is received through the apparatus shown, the valves 0 c are opened and sound-waves pass from the outer or righthand side of the diaphragm B through the tubeC at that end of the instrument, and from the left-hand orinner side of the diaphragmB through the tube 0 at the other side of theinstrument, and through the mouth piece D. The lateral vibrations which are received by the diaphragm B are transmitted from the inner side of that diaphragm through the lefthand sound-tube G, and from the outer side of that diaphragm B through the mouth-piece D, as indicated by the arrows in Fig. 1. In this way the sound-vibrations from both sides of both diaphragms are transmitted to the listener, inasmuch as the tubes 0 and the mouth-piece D are all presented in the same direction, and because the mouth will not be applied to the mouthpiece when receiving a message.

In the example of my invention shown in Fig. 3the box or case A has diaphragms B B, arranged and secured therein substantially as before described, with the soundtube G extending from the end of the box at which is the diaphragm B and a mouth-piece, D, arranged opposite the diaphragm B. It also has valves 0 c, of the same or any other suitable construction, whereby the sound-tubes C can be out off from and placed in communication with the box A, and this instrument also has a rod or connection, b, whereby the diaphragm B is connected with the transmittingwire E. I have in this example of the invention represented the rod or connection 12 between the diaphragm B and the wire E as connected with the diaphragm B by a lever, d e, which is fulcrumed at f in the box A. The shorter arm, 6, of thislever is connected with the diaphragm B, while the longer arm, 01, which is preferably several times the length of the shorter arm, is connected with the rod b.

It will be observed that by means of the lever (1' e the diaphragm B is actuated by the vibrations of the diaphragm B when talking into the mouth-piece D, and this lever serves the same purpose as the branch D of the mouth -piece shown in Fig. 1, the purpose of both the lever and branch mouth-piece D being to conduct and impart to the diaphragm B vibrations in a direction opposite to the tension upon the transmittingwire E. The

lever d e therefore constitutes the full equivalent of the branch month-piece D.

By both the arrangements described the wire E receives both longitudinal and lateral vibrations when talking intothe mouth-piece D D, and both the longitudinal and lateral' vibrations of the wire are transmitted through the two diaphragms B B to the listener when the apparatus is used for receiving a message. What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with a transmittingwire, of two diaphragms, connections between.

one diaphragm and the wire, whereby longitudinal vibrations are transmitted to and re I CC of is hitched, of a sound-tube for conducting vibrations to operate on the diaphragm in a direct-ion opposite to the longitudinal tension or pull of the wire, substantially as herein described.

3. The combination, with a transmitting wire and two diaphragms, to one of which the wire is hitched, and a connection between the other diaphragm and the wire through which lateral vibrations will be transmitted to and received from the wire, whereby the longitudinal and lateral vibrations will be taken up, respectively, by the two diaphragms and sound-tubes,whereby both systems of vibrations, from the sides of the two diaphragms, will be conveyed simultaneously to the listener, substantially as herein described.

4. The combination, with a transmittingwire and two diaphragms, one serving to receive lateral vibrations and the other longitudinal vibrations from the Wire, of soundtubes arranged to convey the vibrations from both sides of each diaphragm to the listener, substantially as herein described.

5. The combination, with a'transmitting wire and a diaphragm arranged transversely thereto, and towhich the wire is hitched, and

which is of sufficient thickness and strength tudinul and lateral vibrations will be simulto bear the strain, of a second diaphragm, teneously transmitted to and received from lighter and more flexible than the hitch-diathe wire, substantially as herein described. phragin, and a connection between the lighter 1 A. \VILFORD HALL.

5 diaphragm and the wire, and through which Witnesses:

lateral vibrations will be transmitted to and FREDK. HAYNES, received from the wire, whereby both longi- HENRY MCBRIDE.

It is hereby certified that in Letters Patent No. 336,640, granted February 23, 1885, upon the application of A. Wilford Hall of New York, New York for an improvement in Mechanical Telephones, an error appears in the printed specification requiring correction, as follows: In line 11 page 1, the word coil should be stricken out and the Word cord inserted instead; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 2d day of March, A. D. 1886.

[SEAL] H. L. MULDROW, Acting Secretary of the Interion Conntersigned M. V. MONTGOMERY,

Oomam'ssimter of Patents.

Correction in Letters Patent No. 336,640.

It is hereby certified that in Letters Patent No. 336,640, granted February 23, 1886, upon the application of A. Wilford Hall of New York, New York, for an improvement in Mechanical Telephones, an error appears in the printed specification requiring correction, as follows: In line 11, page 1, the word coil should he stricken out and the word cord inserted instead; and that the said Letters Patent should he read with this correctiontherein that the same may conform to the record of the casein the Patent Oflice.

Signed countersigned, and sealed this 2d day of March, A. D. 1886.

[SEAL] H. L. MULDROW, Acting Secretary of the Interior. Countersig'ned M. V. MONTGOMERY,

Omnmissioner of Patents. 4 

